What this breaker does for your panel
It's also rated for motor duty at 18.5 kW at 400 V AC-3, so it's a direct fit for a 25 hp (roughly) induction motor on a conveyor or pump. The 15 operations per hour max at AC-3 tells you this isn't for frequent jogging — it's a branch-circuit protector, not a switching device.
Zero clearance needed at the sides or back — you can pack these tight on the rail. The IP20 front means it's finger-safe once installed in an enclosure; the terminals are screw-type with box terminals for the main circuit and separate screw terminals for the aux/control circuit. Wire sizes: solid up to 2x 16 mm², stranded up to 2x 50 mm² (or 1x 70 mm²). That's heavy enough for the 40 A feed. The auxiliary switch option is built in — you can add a signal contact for remote status without extra enclosure space.